when I go to foward an email to an external address the field is greyed out

ok here is a screen shot of what I am talking about.
ON EE for some reason this questin has been asked and never really answered. I am hoping that some exchange experts have joined since then. so I need for the forward field not to be greyed out how do I fix it.
Server is SBS 2003 with sp2 on the exchange.
Please do not give me any information on creating the contact as I have done that.
Also do not tell me that it has to be done on the outlook side of things. That also in not true.

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Expand domain
DC
Navigate to the OU where the user is located.
Right click on username > properties.

on Attribute Editor
Edit this Attribute.
>>altRecipient<<

If the email account is not being forwarded, then the value will be
<not set>

Click Edit
and enter the path to the mailbox to which it will be forwarded.
Something like - CN=John Smith,OU=Users,OU=Company,DC=DOMAIN,DC=com (not sure how your AD is structured..)
OR YOU can copy the value using the method below.

What I'd do is:
Right click on AdsiEdit to the name of the person to who mails will get Forwarded To (John Smith).
Look for Attribute
>>Distinguished Name<<
Click Edit
Copy the Value from here.